Gas-fuel steam-generator



W. DOUGHERTY.

GAS FUEL STEAM GENERATOR.

APPLICATION FILED JULY 29,1919.

Patented Nov. 4, 1919.

n rare WILLIAM DOUGHERTY, OF CHESTER, PENNSYLVANIA, ASSIGNOR OF ONE-THIRD TO MARGARET E. GRUNDY AND ONE-THIRD' T0 ANNA C. lVIORTLAND, BOTH OF CHESTER, PENNSYLVANIA.

Specification of Letters Patent.

Patented Nov. 4, 1919.

Application filed July 29, 1919. Serial No. 314,147.

To all whom z't may concern Be it known that I, WILLIAM DOUGHERTY, citizen of the United States, residing at Chester, in the county of Delaware and State of Pennsylvania, have invented certain new and useful Improvements in Gas- Fuel Steam- Generators, of which the following is a specification.

This invention relates to gas fuel steam generators, and belongs to that class of water heaters intended more especially for producing steam or vapor or for heating water for the circulating systems of buildings to suitably heat the structures in cold weather.

The object of this invention is the production of a steamer or heater using gas fuel, having parts of special construction and arrangement, and it is intended as an improvement upon the construction of the generator set forth in Letters Patent of the United States, No. 830,138, issued to this applicant September 4, 1906. The improvement is believed to consist in the use of straight tubes throughout instead of curved tubes whereby the cost of the tubes and the cost of the labor of setting them are both materially reduced, and it is thought the special construction hereinafter described affords more heating surface and that such surface is better arranged to take up the heat from the hot gases than in the former generator.

In the accompanying drawings the special construction and arrangement of the parts of this invention are illustrated, and Figure 1 represents a side View of all parts assembled shown partly in vertical section. Fig. 2 is a horizontal cross-section taken upon the broken line 22 of Fig. 1.

Throughout the drawings and description the same letter is employed to refer to the same part.

Considering the drawings, the legs A or stand support an annular base a, within which is arranged a burner B fed by a gas pipe 6.

The body of the generator comprises the outer shell C and an inner shell 0. The inner shell is of less diameter than the outer shell whereby there is formed a water space D between the shells, which are closed at the top as hereinafter explained, and have their bottom edges in connection with the base casting a. The inner shell is less in height than the outer shell whereby there is formed the steam space (5, above the top or crown sheet E of the inner shell.

The steam or hot water leaves the steam space cl by way of the valved connection 6.

A baffle F is located within the inner shell, and extends part way across the interior of the shell as indicated in Fig. 2. The battle will be again mentioned. It will be noted in Fig. 1 that the baffle F is arranged below the smoke pipe f, and that the smoke pipe passes through both shells into the interior or chamber of the inner shell.

lVater is delivered to the generator from any source, such as the collecting tank G, into which the condensation from the heating system descends, and the water thus accun'iulated passes by way of downflow pipe g, through the check valve H, and feed pipe ll, into the bottom of the outer shell C. It will be observed that a circulation pipe 72,, of which there may be more than one, passes below the drum J and above the burner and connects the bottom of the drum with the bottom of the inner shell. The circulation of the water in the generator proceeds clownwardly between the shells, and upwardly by way of the drum and water tubes j. The tubes j are straight tubes, and they are connected with the top of the heating drum J, and pass through the top or crown sheet of the inner shell 0, into connection with which the ends of the tubes are expanded in the usual way.

In Fig. 1 it is shown that the top of the outer shell C, marked K, and the bottom of the heating drum J, marked 76, are of domed or dished construction. This form adds materially to the resistance of internal or external pressures.

In the operation of this invention, the space between the shell, the heating drum, and the water tubes j, are filled with water which covers the crown sheet E. The heated gases, as indicated by the arrows in Fig. 1, pass upwardly about the drum J and among the tubes A great portion of such gases passes twice through the water tubes, their course being first below and then above the horizontal baffle F. The arrangement of the parts as above described has been found to be particularly effective as a steam or vapor generator or hot water heater for househeating purposes, and it is an especially economical user of gas fuel in view of the results attained.

Having now explained this invention and the mode of its operation, what I claim is 1. In a gas fuel steam generator, the combination with an annular base, of a burner supported within the base, an outer shell closed at the top and having its bottom edge in connection with the said base, an inner shell closed at the top and having its bottom edge in connection with the said base, the said inner shell being of less diameter than the outer shell whereby a water pace is formed between them, the said inner shell being less in height than the outer shell whereby a steam space is formed above the inner shell, a smoke pipe passing through both shells, a heating drum located within the inner shell, a circulation pipe connecting the said inner shell and said drum, tubes connected with the said drum and passing through the top or crown sheet of said inner shell, and a bafiie arranged horizontally within the inner shell below the mouth of the said smoke pipe and extending part of the way across the interior of the shell, the said tubes pass ing through the said bafiie.

2. In a gas fuel generator, the combination with an annular base, of a burner supported within the base, an outer shell closed at the top, and having its bottom edge in connection with the said base, an inner shell closed at the top and having its bottom edge in connection with the said base, the said inner shell being of less diameter than the outer shell whereby a water space is formed between them, the said inner shell being less in height than the outer shell whereby a steam pace is formed above the said inner shell, a smoke pipe passing through both shells, a heating drum located within the inner shell, a circulation pipe connecting the inner shell and drum, straight tubes connected with the top of the said drum and passing through the top or crown sheet of the inner shell, and a bafiie arranged horizontally within the inner shell below the mouth of the smoke pipe and extending part of the way across the interior of the inner hell, the said tubes passing through the said bafile. V

3. In a gas fuel steam generator, the combination with an annular base, of a burner supported within the base, an outer shell closed at the top and having its bottom edge Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

whereby a steam space is formed above the inner shell, a smoke pipe passing through both shells, a heating drumlocated within the inner shell, a circulation pipe arranged below the said drum and above the said burner and connecting the said inner shell and drum, a feed pipe connected with the said outer hell below the opening of the said circulation pipe in the inner shell,

straight tubes connected with the said drum and passing through the to or crown sheet of the inner shell, and a bafii e arranged horizontally within the inner shell below the mouth of the smoke pipe and extending part of the way across the interior of the said inner shell, the said tubes passing through the aid baflle.

4. In a gas fuel steam generator, the combination with an annular base, of a'burner supported within the base, an outer shell closed at the top and having its bottom edge in connection with the said base, an inner shell closed at the top and having its bOttom edge in connection with the said base, the said inner shell being of less diameter than the outer shell whereby a water space is formed betweenthem, the said inner shell being less in height than the outer shell whereby a steam spaceis formed above the inner shell, a smoke pipe passing through both shells, a heating drum located within the inner shell, the said outer shell having a domed top and the said drum having a domed bottom, a circulation pipe arranged below the said drum and above the said burner and connecting the said domed bottom of the drum and the inner shell, straight tubes connected with the said drum and passing through the top or crown sheet of the inner shell, and a baffle arranged horizontally within theinner shell below the mouth of the smoke pipe and extending part of the way across the interior of the said inner shell, the said tubes passing through the said baffle.

In testimony whereof I affix my signature.

WVILLIAM DOUGHERTY.

' Washington, D. 0. 

